Hi SuperSeeta, thanks for your feedback
Your feedback is being shared with the team, who are continuing to update and improve the messaging experience.
Regarding the notification sound not working consistently—could you please let us know how often this happens and on which device(s)? Is it only happening on a specific computer or mobile device, or do you notice it across all your devices? How often does it happen? This information will help us troubleshoot the issue more effectively.
In the meantime, I recommend checking out Glenn's post here for some helpful information on navigating the new inbox experience.
Thank you again for taking the time to provide your input.